Synthesis of fluorescent 2,3,5,6-tetraalkynylpyridines by site-selective Sonogashira-reactions of 2,3,5,6-tetrachloropyridines
作者:Peter Ehlers、Andranik Petrosyan、Antje Neubauer、Timo Bröse、Stefan Lochbrunner、Tariel V. Ghochikyan、Ashot S. Saghyan、Peter Langer
DOI:10.1039/c4ob01292e
日期:——
6-tetraalkynylpyridines were prepared by tetra-fold Sonogashirareactions of the corresponding 2,3,5,6-tetrachloropyridines. 2,6-Dialkynyl-3,5-dichloropyridines were prepared by site-selectiveSonogashirareactions from various 4-unsubstituted and 4-substituted tetrachloropyridines. Subsequent two-fold Sonogashirareactions of the products allowed for the synthesis of various 2,3,5,6-tetraalkynylpyridines containing